Steam-boiler



(No Model.)

H. GRIM'MF STEAM BOILER Patented Oct UNITED STATES PATENT OFFICE.

HENRY GRIMM, OF QUINCY, ILLINOIS.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 307,295, dated October28, 1884.

Application filed June 26, 1884.

T at whom it may concern..-

Be it known that I, HENRY GRIMM, of Quincy, in the county of Adams andState of Illinois, have invented a new and useful Improvement inSteam-Boilers; and I do hereby declare that the following is a full,clear, and

exact description of the same.

My invention is an improvement in boilers, whereby free and easy accessmay be had into the interior of the same and the sediment or scaleremoved therefrom.

'My invention relates more particularly to that class of boilers knownas vertical, in which the fire-tubes run vertically from a crown-platesituated directly over the firebox. In this form of boiler the mud orsediment from the water, collecting upon the head or crown-plate, formsathick non-conducting covering upon the same, which not only retards theprocess of heating and reduces the efficacy of the boiler, but by reasonof the corrosive action it exerts upon the metal causes leakage at thepipe-joints and renders the boiler liable to explosion.

To provide a simple and effective arrangement whereby the head orcrown-plate may be cleaned and kept free from sediment or scale is theobject of my invention.

To this end my invention consists in, first, the peculiar arrangement ofthe fire-tubes in groups, whereby passages are formed between the tubesextending across the crown-plate in different directions, and ofsufficient width to admit any desired form of scraper or brush for thepurpose of cleaning; second, in forming in the side of the boiler and inline with the said passages hand-holes for the admission of the brush orscraper.

In the drawings I have shown only one way of grouping the pipes,although obviously the form and. number of groups may be greatly variedwithout departing from the spirit of my invention, it being onlyessential that the passages be formed as before stated.

The accompanying drawings show, in Figure 1, a central vertical sectionthrough the boiler, and in Fig. 2 a central horizontal section throughthe same on line 00 x of Fig. 1.

In the drawings, A is the boiler, having the head 13 riveted or's'ecuredthereto in the usual way. The fire-box G is situated within (N0 model.)

the lower portion of the boiler, extending up within the same, so as toform an annular water-space, a, between the shell of the boiler and thatof the fire-box, thus exposing the from the crown-plateE to the upperhead, B,

of the boiler, being secured in each in the ordinary manner.

In order to provide for the cleaning of the erowirplate, the pipes arearranged in groups 0 c, as shown in Fig. 2, passages or channels F Fbeing thus formed between the said groups and extending across thecrown-plate, so that a scraper or brush may be admitted between thetubes to free the plate from all sediment or scale. In line with thepassages and the upper surface of the crown'plate, hand-holes H H areformed in the shell of the boiler, of suiiicient size to convenientlyadmit I a scraper or other cleaning-instrument. They may be kept closedby any suitable plates and nuts, so as to form water-tight joints.

It is not essential that the pipes be grouped with the regularity shownin the drawings, nor that the passages be made to run through the centerof the boiler; but the arrangement of the pipes may be such as will formpassages to one side of the center, running in any direction, so thatthe surface of the crown-plate may be left clear to any desired extent.

A hand-hole may be formed at either end of each passage, if desired.

Having described my invention, what I claim is i In a boiler, thecombination of the fire-tubes, arranged in groups so as to form passagesor channels between the same, and the handholes formed in theboiler-shell and in line with the said passages, substantially asdescribed.

In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing witnesses.

HENRY GRIMM.

\Vitnesses:

VALENTINE KOUDER, Gno. A. BINKERT.

